Grate for furnaces.



' A. W. FINLAYSON.

Patented Dec. H, 1911?.

2 SHEETS-SHEET 2.

A TTOR/IIE V taaaaea;

To all whom z't may concernij I 1 Be it known that I, ALEXANDERW- *FIN- Larson, a citizen ofthe .United States, residing at Detroit, in the countyof Wayne and State of Michigan, have invented-a new and useful Grate for Furnaces, of. which the following is a specification.

This invention relates to grates for fur naces, and it consists in the novel features of construction andarrangement of parts as hereinafter set forth and. claimed. 1 v

The invention has for its object'to provide a grate of simple and improved form for usein the fire boxes of boilers, furnaces and the like, in which the bed of the grate is composed of a plurality of hollow cylindrical bars journaled to rotate independently upon transverse supporting rails adjustably and removablymounted in the base of the furnace, which latter is provided with removable caps or closures, through which said rails and bars may be passed to faoilitate assembling and permit of removal for repair and replacement.

The invention contemplates such a struc-' tural arrangement of the. grate bars as will render them hollow to permit circulation of air longitudinally therethrough as a means of coolinm thebars to prevent warping. These bars, which are assembled in adjacent parallel relation, are provided with a series of longitudinally and circumferentially spaced radially projecting peripheral fins or lugs which form an open grate-like bed for supporting the fuel, and which,

when said bar is rotated, serve to agitate the fuel to release and separate the ashes there from.

A preferred embodiment of the essential features of the invention is illustrated in the accompanying drawings, in which,

Figure 1 is a plan view of the base of a furnace showing the grate bars mounted therein as in operation.

Fig. 2 is a front elevation of the base partly in transverse section, as on dotted line 22 of Fig. 1.

Fig. 3 is a central vertical longitudinal section through the base and one of the grate bars, and showing a portion of a crank handle engagedwith one end of the bar.

Fig. 4 is a perspective view of the furnace base having the grate bars removed from the supporting rails which are also removably mounted in said base.

Fig. 5 is a fragmentary detail of a por- Specification of Letters Patent.

i *Application filed May 22, 1916.' Serial No. 99,034.

ings 9. the'base are provided at opposite ends with ALEXANDER. w. FINLAYSON, or person, MICHIGAN.

Patented Dec. 111,1911'3'.

tion of the base showing one of the supporting rails partially. withdrawn through an opening, therein. 1 a 1 a a Fig. 6 is a sectional view through. one of the caps for closing the opening in the base through which the rail is removed. a Referring to the parts by the characterszof reference. marked on the drawings, 1.indicates a rectangular-base or ash pan upon which the furnace. or heater is mounted- This base consists of flanged side walls 2, to the ends of. which the front end walls3 and 4 are secured in overlapping engagement'by bolts,ias at 5. The front wall 3 is provided with an opening 6, the upper portion of which 1 extends upwardly and outwardly through said wall. This openingis closed by a removable plate, 7 secured to the wall by bolts as at 8, and formed transversely through this plate is a series of spaced open- (SeeFig. 4.) V The side walls 2 of openings 10, through which transverse sup porting rails 11 are passed into said base.

These rails are formed with a series of U- shaped bearing openings 12 in their upper edges, which are spaced to lie in registering alinement with the openings 9 of the front plate 7 when said rails are positioned with in the base. The ends of the rails 11 are supported in the openings 10 of the side walls 2 by means of hollow outwardly curved caps 13. These caps are formed at their lower ends with an offset depending.

tongue 14: forming a shoulder 15, the latter of which rests upon the lower edge of the wall of the opening 10, and the former. engages the inner face of said wall to anchor. the lower ends of the caps against outward movement. The upper ends of the caps are bifurcated, as at 17, and are detachably locked in engagement with the outer faces of the walls 2 by means of lugs 18 which project laterally from said walls through the bifurcated ends of said caps and receive transverse locking pins 19. (See Figs. 2 and 4.) Set screws 20, extended at an incline through the bases of the caps 18, seat at their inner ends againstannular surfaces 21 on the ends of the rails 11, and serve to raise erase rannr rein. v

and adjust said rails to the required position V to aline the U-shaped bearing openings therein with the openings of the front plate 7. Mounted to rotate in the bearings of these rails, and extending at their forward ends through the openings in the plate 7, is

the end portions, which serve as trunnions upon which the bars rotate in the bearings of -tlie supporting rails, are cored out to form reduced passages and 26communieating with the passage 24 to provide for the circul'ati'on of air longitudinally through the 'barsz The forward 'ends of the bars extending throughuthe front plate 7 are formed r with? angular peripheral surfaces 27 to provide' a wrench hold for reception in the socket 28 of'a'icrank handle 29 '(see Figs. 2 andil3 ),by means of which said lbars may be rotated independently to agitate the fuel and release the ashes therefrom into the base? of thea ifurnaoe. f 7 7 g 1 it By this construction of the bars and means 7 for mountingithem in the base of the fur- I naoe, the" grate is formed 'ofaplurality of units, which be readily inserted'for assembling or Withdrawn singly or collectively for repairor replacement, and through the Copies of -'this :-patent may be obtained for provision of the radially projecting lugs upon which the fuel and fire are supported, together with the rotatability of the bars, the entire circumferential area of the bar is rendered available for service at intervals byrolling the bar so as to present an unused surface when the exposed surface has become worn or damaged by the fire, while the hollow formation of the bar permitting the circulation of air therethrough tends to keep down the temperature in the body of the'bar to prevent Warping from overheating and thus to enhance the life of the bar and the effective service of the grate.

I claim In a grate, the combination of a base having alined openings in opposite walls thereof, removable caps for closing said openings, transverse supporting rails adjustably mounted at opposite ends in said caps and removable therewith through said openings, and a plurality of grate bars rotatably and removably mounted in said rails and extending at their forward ends through said base.

In testimony whereof, I sign this specification.

ALEXANDER w. FINLAYsoN.

five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

